The ER18M391JKR from Gowanda Electronics is a RF Inductor with Inductance 3.9 uH, DC Resistance 0.155 Ohms, DC Current 870 mA, Self Resonant Frequency 65 MHz, Operating Temperature -55 to 105 Degree C. Tags: Ceramic Inductor, Wire Wound Inductor. More details for ER18M391JKR can be seen below.